// support.js
class Container {
  static of (value) {
    return new Container(value)
  }
  constructor (value) {
    this._value = value
  }
  map (fn) {
    return Container.of(fn(this._value))
  }
}

class Maybe {
  static of (x) {
    return new Maybe(x)
  }
  isNothing () {
    return this._value === null || this._value === undefined
  }
  constructor (x) {
    this._value = x
  }
  map (fn) {
    return this.isNothing() ? this : Maybe.of(fn(this._value))
  }
}

module.exports = {
  Maybe,
  Container
}